Cannot use custom pins for SPI on esp32-pico-v3

[brahmajit]

I'm trying to use custom pins for SPI (the multiple SPI example). But getting the `Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled.` error. I have decoded the backtrace. Any help would be appreciated.

My sketch

Code: [Select all] [Expand/Collapse]

1.  
2. /* The ESP32 has four SPi buses, however as of right now only two of
3.  * them are available to use, HSPI and VSPI. Simply using the SPI API
4.  * as illustrated in Arduino examples will use VSPI, leaving HSPI unused.
5.  *
6.  * However if we simply intialise two instance of the SPI class for both
7.  * of these buses both can be used. However when just using these the Arduino
8.  * way only will actually be outputting at a time.
9.  *
10.  * Logic analyser capture is in the same folder as this example as
11.  * "multiple_bus_output.png"
12.  *
13.  * created 30/04/2018 by Alistair Symonds
14.  */
15. #include <SPI.h>
16.  
17. // Define ALTERNATE_PINS to use non-standard GPIO pins for SPI bus
18.  
19. #ifdef ALTERNATE_PINS
20.   #define VSPI_MISO   2
21.   #define VSPI_MOSI   4
22.   #define VSPI_SCLK   0
23.   #define VSPI_SS     33
24.  
25.   #define HSPI_MISO   26
26.   #define HSPI_MOSI   27
27.   #define HSPI_SCLK   25
28.   #define HSPI_SS     32
29. #else
30.   #define VSPI_MISO   MISO
31.   #define VSPI_MOSI   MOSI
32.   #define VSPI_SCLK   SCK
33.   #define VSPI_SS     SS
34.  
35.   #define HSPI_MISO   12
36.   #define HSPI_MOSI   13
37.   #define HSPI_SCLK   14
38.   #define HSPI_SS     15
39. #endif
40.  
41. static const int spiClk = 1000000; // 1 MHz
42.  
43. //uninitalised pointers to SPI objects
44. SPIClass * vspi = NULL;
45. SPIClass * hspi = NULL;
46.  
47. void setup() {
48.   //initialise two instances of the SPIClass attached to VSPI and HSPI respectively
49.   vspi = new SPIClass(VSPI);
50.   hspi = new SPIClass(HSPI);
51.  
52.   //clock miso mosi ss
53.  
54. #ifndef ALTERNATE_PINS
55.   //initialise vspi with default pins
56.   //SCLK = 18, MISO = 19, MOSI = 23, SS = 5
57.   vspi->begin();
58. #else
59.   //alternatively route through GPIO pins of your choice
60.   vspi->begin(VSPI_SCLK, VSPI_MISO, VSPI_MOSI, VSPI_SS); //SCLK, MISO, MOSI, SS
61. #endif
62.  
63. #ifndef ALTERNATE_PINS
64.   //initialise hspi with default pins
65.   //SCLK = 14, MISO = 12, MOSI = 13, SS = 15
66.   hspi->begin();
67. #else
68.   //alternatively route through GPIO pins
69.   hspi->begin(HSPI_SCLK, HSPI_MISO, HSPI_MOSI, HSPI_SS); //SCLK, MISO, MOSI, SS
70. #endif
71.  
72.   //set up slave select pins as outputs as the Arduino API
73.   //doesn't handle automatically pulling SS low
74.   pinMode(VSPI_SS, OUTPUT); //VSPI SS
75.   pinMode(HSPI_SS, OUTPUT); //HSPI SS
76.  
77. }
78.  
79. // the loop function runs over and over again until power down or reset
80. void loop() {
81.   //use the SPI buses
82.   vspiCommand();
83.   hspiCommand();
84.   delay(100);
85. }
86.  
87. void vspiCommand() {
88.   byte data = 0b01010101; // junk data to illustrate usage
89.  
90.   //use it as you would the regular arduino SPI API
91.   vspi->beginTransaction(SPISettings(spiClk, MSBFIRST, SPI_MODE0));
92.   digitalWrite(VSPI_SS, LOW); //pull SS slow to prep other end for transfer
93.   vspi->transfer(data);  
94.   digitalWrite(VSPI_SS, HIGH); //pull ss high to signify end of data transfer
95.   vspi->endTransaction();
96. }
97.  
98. void hspiCommand() {
99.   byte stuff = 0b11001100;
100.  
101.   hspi->beginTransaction(SPISettings(spiClk, MSBFIRST, SPI_MODE0));
102.   digitalWrite(HSPI_SS, LOW);
103.   hspi->transfer(stuff);
104.   digitalWrite(HSPI_SS, HIGH);
105.   hspi->endTransaction();
106. }

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Output from serial monitor

Code: Select all

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 271414342, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:10124
load:0x40080400,len:5856
entry 0x400806a8
Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled.
Core 1 register dump:
PC      : 0x40080f31  PS      : 0x00060730  A0      : 0x800d0f3d  A1      : 0x3ffb1f30
A2      : 0x0000000e  A3      : 0x00000002  A4      : 0x3ffb8364  A5      : 0x00000001
A6      : 0x00000000  A7      : 0x00000004  A8      : 0x3f400674  A9      : 0xaaaaaaaa
A10     : 0xaaaaaaaa  A11     : 0x00000030  A12     : 0x3ffb82cc  A13     : 0x00000000
A14     : 0x00000000  A15     : 0x00000000  SAR     : 0x00000009  EXCCAUSE: 0x0000001c
EXCVADDR: 0xaaaaaaaa  LBEG    : 0x400d1258  LEND    : 0x400d1265  LCOUNT  : 0x00000000

ELF file SHA256: 0000000000000000

Backtrace: 0x40080f31:0x3ffb1f30 0x400d0f3a:0x3ffb1f50 0x400d0db2:0x3ffb1f70 0x400d0c2b:0x3ffb1f90 0x400d190a:0x3ffb1fb0 0x40085fa5:0x3ffb1fd0

Rebooting...
ets Jul 29 2019 12:21:46

The decoded backtrace

Code: Select all

0x40080f31: __pinMode at C:\Users\newto\OneDrive\Documents\ArduinoData\packages\esp32\hardware\esp32\1.0.5\cores\esp32\esp32-hal-gpio.c line 115
0x400d0f3a: spiAttachSCK at C:\Users\newto\OneDrive\Documents\ArduinoData\packages\esp32\hardware\esp32\1.0.5\cores\esp32\esp32-hal-spi.c line 87
0x400d0db2: SPIClass::begin(signed char, signed char, signed char, signed char) at C:\Users\newto\OneDrive\Documents\ArduinoData\packages\esp32\hardware\esp32\1.0.5\libraries\SPI\src\SPI.cpp line 57
0x400d0c2b: setup() at C:\Users\newto\OneDrive\Documents\ArduinoData\packages\esp32\hardware\esp32\1.0.5\libraries\SPI\examples\SPI_Multiple_Buses/SPI_Multiple_Buses.ino line 67
0x400d190a: loopTask(void*) at C:\Users\newto\OneDrive\Documents\ArduinoData\packages\esp32\hardware\esp32\1.0.5\cores\esp32\main.cpp line 32
0x40085fa5: vPortTaskWrapper at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/port.c line 143

[ESP_Sprite]

From the pico-v3 datasheet:

None of the embedded flash data pins are connected externally on ESP32-PICO-V3. These are connected internally to GPIO16, GPIO17, GPIO18, and GPIO23.

MOSI on Arduino is defined to 23, making the example try to reconfigure a pin the SoC needs for flash access. Suggest you change that to something else.